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Latvian Gambit: Mason Countergambit

239K games from Lichess · Updated January 2026

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Analyze this line move by move

White expected score · All ratings · All speeds

50.8%

45%55%
Floor50.6%

the worst score you would still get, 90% confident. At best 51.0%.

Measured over 239K games at this level and clock.

Playablewins about as often as it loses at this level

Roughly even — the middlegame decides more than this opening choice does.

Outcomes for White

Draw 2.8 · Score = win + ½ of the draws · 239K games

Rank among the families White can choose here
not ranked — this is a variation, not a family
Games in this context
239K
Best context
58.0% at 1000-1199 Rapid
Worst context
48.5% at 2000-2199 Bullet
Average game length
29 moves
Games that end decisively
97.2%
Draws
2.8%

Best and worst are the strongest and weakest squares with at least 500 games behind them. The table further down shows every square, including thinner ones.

Extra Analysis

Deep-dive datasets for this opening

Gambit BreakpointWhite

Peak: +9.9% · Breakpoint: 1800-1999

Time-Control Swing

Max swing: 8.0% · UltraBullet best · Bullet worst

Where it holds · White score by rating × clock

Green is clearly ahead for White, grey is around even, red is behind. Tap a cell to measure there, and again to clear. It holds about the same all the way up, near 50.7%.

RatingUBBulleBlitzRapidClass
0-999
1000-1199
1200-1399
1400-1599
1600-1799
1800-1999
2000-2199
2200-2499
2500+

Expected score matrix by rating bracket and time control

  • 0-999 rating, UltraBullet: 56.7% expected score (21 games)
  • 0-999 rating, Bullet: 54.8% expected score (2,231 games)
  • 0-999 rating, Blitz: 53.9% expected score (2,796 games)
  • 0-999 rating, Rapid: 56.7% expected score (1,241 games)
  • 0-999 rating, Classical: 31.5% expected score (12 games)
  • 1000-1199 rating, UltraBullet: 59.4% expected score (57 games)
  • 1000-1199 rating, Bullet: 55.1% expected score (4,571 games)
  • 1000-1199 rating, Blitz: 55.6% expected score (4,253 games)
  • 1000-1199 rating, Rapid: 58.0% expected score (1,567 games)
  • 1000-1199 rating, Classical: 48.3% expected score (27 games)
  • 1200-1399 rating, UltraBullet: 56.8% expected score (139 games)
  • 1200-1399 rating, Bullet: 51.6% expected score (8,980 games)
  • 1200-1399 rating, Blitz: 55.5% expected score (7,307 games)
  • 1200-1399 rating, Rapid: 56.5% expected score (2,207 games)
  • 1200-1399 rating, Classical: 45.7% expected score (45 games)
  • 1400-1599 rating, UltraBullet: 54.5% expected score (538 games)
  • 1400-1599 rating, Bullet: 50.7% expected score (14,290 games)
  • 1400-1599 rating, Blitz: 54.4% expected score (12,671 games)
  • 1400-1599 rating, Rapid: 56.4% expected score (2,679 games)
  • 1400-1599 rating, Classical: 58.1% expected score (122 games)
  • 1600-1799 rating, UltraBullet: 60.7% expected score (410 games)
  • 1600-1799 rating, Bullet: 48.8% expected score (21,253 games)
  • 1600-1799 rating, Blitz: 51.7% expected score (20,123 games)
  • 1600-1799 rating, Rapid: 53.4% expected score (2,910 games)
  • 1600-1799 rating, Classical: 59.0% expected score (171 games)
  • 1800-1999 rating, UltraBullet: 62.0% expected score (128 games)
  • 1800-1999 rating, Bullet: 49.2% expected score (28,447 games)
  • 1800-1999 rating, Blitz: 49.7% expected score (25,532 games)
  • 1800-1999 rating, Rapid: 51.9% expected score (3,538 games)
  • 1800-1999 rating, Classical: 55.4% expected score (204 games)
  • 2000-2199 rating, UltraBullet: 47.3% expected score (89 games)
  • 2000-2199 rating, Bullet: 48.5% expected score (23,645 games)
  • 2000-2199 rating, Blitz: 49.7% expected score (18,419 games)
  • 2000-2199 rating, Rapid: 52.4% expected score (2,320 games)
  • 2000-2199 rating, Classical: 62.4% expected score (51 games)
  • 2200-2499 rating, UltraBullet: 53.1% expected score (79 games)
  • 2200-2499 rating, Bullet: 48.8% expected score (15,988 games)
  • 2200-2499 rating, Blitz: 50.3% expected score (6,125 games)
  • 2200-2499 rating, Rapid: 56.0% expected score (510 games)
  • 2200-2499 rating, Classical: 57.7% expected score (5 games)
  • 2500+ rating, UltraBullet: 61.2% expected score (3 games)
  • 2500+ rating, Bullet: 48.5% expected score (2,432 games)
  • 2500+ rating, Blitz: 50.0% expected score (375 games)
  • 2500+ rating, Rapid: 68.2% expected score (4 games)
  • 2500+ rating, Classical: 30.0% expected score (1 games)

Related Openings

Parent
Latvian Gambit
49.8%
Variations (5)
Latvian Gambit: Mlotkowski Variation
49.5%
Latvian Gambit: Mayet Attack, Morgado Defense
53.0%
Latvian Gambit: Clam Gambit
44.6%
Latvian Gambit: Mayet Attack
52.4%
Latvian Gambit: Fraser Defense
45.5%
Analyze Latvian Gambit: Mason Countergambit PositionsSee what each move is worth at your rating, move by move

Methodology

Across every rating and clock, the Latvian Gambit: Mason Countergambit scores 50.8% for White — we are 90% confident the real figure is between 50.6% and 51.0% — from 239K Lichess games. Win rate, draw rate and loss rate come from games played December 2023 to November 2025.

How the figures are made
Whose games these are
239K+ rated games played on Lichess (2023-12 to 2025-11). The games are Lichess’s and free for anyone to use. What is ours is the reading of them. Last rebuilt January 2026.
Which games we count
  • Rated games only — nothing casual.
  • Both players within 200 rating points of each other. A mismatch tells you about the gap, not about the opening.
  • At least 2 moves played.
  • A game is filed under White’s rating.
Why every number comes with a range
A number off a few hundred games is a guess. The same number off millions is a fact. The range is what tells them apart, and it is what the lists rank on — so an opening cannot reach the top on a lucky run of forty games. The more games behind a figure, the narrower its range.
How much we need before we say anything
An opening page needs 100 games. A gambit needs 50 games at a rating before we will say whether it pays there. The chaos and trap lists need 500 games overall and 250 games at one rating or clock.

Frequently Asked Questions

What is the Latvian Gambit: Mason Countergambit win rate?

Playing the Latvian Gambit: Mason Countergambit, White wins 49.4%, draws 2.8% and loses 47.8%. Counting a draw as half a point, that is an Expected Score of 50.8%. It rests on 239K rated games from Lichess.

At what rating does the Latvian Gambit: Mason Countergambit perform best?

The Latvian Gambit: Mason Countergambit performs best for White at 1000-1199, with an Expected Score of 55.8% (10K games) and the highest Floor of any rating with enough games to read.

Is the Latvian Gambit: Mason Countergambit better in blitz or rapid?

For White, the Latvian Gambit: Mason Countergambit scores higher in Rapid: an Expected Score of 51.6% in Blitz (98K games) against 54.6% in Rapid (17K games).

How sharp is the Latvian Gambit: Mason Countergambit?

The Latvian Gambit: Mason Countergambit has a sharpness score of 97.2 (very decisive), meaning 97.2% of games end decisively. Average game length is 29 moves.

What is the Latvian Gambit: Mason Countergambit win rate at 0-999?

At 0-999, White wins 53.4%, draws 2.6% and loses 44.0%. Counting a draw as half a point, that is an Expected Score of 54.7%. It rests on 6.3K Lichess games, which average 23 moves.

What is the Latvian Gambit: Mason Countergambit win rate at 1000-1199?

At 1000-1199, White wins 54.8%, draws 1.8% and loses 43.3%. Counting a draw as half a point, that is an Expected Score of 55.8%. It rests on 10K Lichess games, which average 24 moves.

What is the Latvian Gambit: Mason Countergambit win rate at 1200-1399?

At 1200-1399, White wins 52.8%, draws 1.8% and loses 45.4%. Counting a draw as half a point, that is an Expected Score of 53.7%. It rests on 19K Lichess games, which average 26 moves.

What is the Latvian Gambit: Mason Countergambit win rate at 1400-1599?

At 1400-1599, White wins 51.9%, draws 1.9% and loses 46.2%. Counting a draw as half a point, that is an Expected Score of 52.9%. It rests on 30K Lichess games, which average 26 moves.

What is the Latvian Gambit: Mason Countergambit win rate at 1600-1799?

At 1600-1799, White wins 49.4%, draws 2.4% and loses 48.3%. Counting a draw as half a point, that is an Expected Score of 50.6%. It rests on 45K Lichess games, which average 28 moves.

What is the Latvian Gambit: Mason Countergambit win rate at 1800-1999?

At 1800-1999, White wins 48.2%, draws 2.9% and loses 48.9%. Counting a draw as half a point, that is an Expected Score of 49.7%. It rests on 58K Lichess games, which average 30 moves.

What is the Latvian Gambit: Mason Countergambit win rate at 2000-2199?

At 2000-2199, White wins 47.5%, draws 3.5% and loses 49.1%. Counting a draw as half a point, that is an Expected Score of 49.2%. It rests on 45K Lichess games, which average 32 moves.

What is the Latvian Gambit: Mason Countergambit win rate at 2200-2499?

At 2200-2499, White wins 47.3%, draws 4.1% and loses 48.6%. Counting a draw as half a point, that is an Expected Score of 49.4%. It rests on 23K Lichess games, which average 34 moves.

What is the Latvian Gambit: Mason Countergambit win rate at 2500+?

At 2500+, White wins 46.1%, draws 5.1% and loses 48.8%. Counting a draw as half a point, that is an Expected Score of 48.7%. It rests on 2.8K Lichess games, which average 36 moves.

What is the Latvian Gambit: Mason Countergambit win rate in UltraBullet?

In UltraBullet, White wins 56.5%, draws 0.8% and loses 42.7%. Counting a draw as half a point, that is an Expected Score of 56.9%. It rests on 1.5K Lichess games.

What is the Latvian Gambit: Mason Countergambit win rate in Bullet?

In Bullet, White wins 48.5%, draws 2.2% and loses 49.3%. Counting a draw as half a point, that is an Expected Score of 49.6%. It rests on 122K Lichess games.

What is the Latvian Gambit: Mason Countergambit win rate in Blitz?

In Blitz, White wins 49.8%, draws 3.4% and loses 46.7%. Counting a draw as half a point, that is an Expected Score of 51.6%. It rests on 98K Lichess games.

What is the Latvian Gambit: Mason Countergambit win rate in Rapid?

In Rapid, White wins 52.8%, draws 3.5% and loses 43.7%. Counting a draw as half a point, that is an Expected Score of 54.6%. It rests on 17K Lichess games.

What is the Latvian Gambit: Mason Countergambit win rate in Classical?

In Classical, White wins 53.9%, draws 4.1% and loses 42.0%. Counting a draw as half a point, that is an Expected Score of 56.0%. It rests on 638 Lichess games.

Is the Latvian Gambit: Mason Countergambit a good opening?

The Latvian Gambit: Mason Countergambit is about level. Across all ratings, White wins 49.4% of its games and loses 47.8%. It performs best at 1000-1199. Your results depend on your rating, time control, and how well you know the typical plans.